Chapter 2. System Requirements
18
2.3.2.1. Perl Prerequisites
For Red Hat Enterprise Linux systems, use the Perl version that is installed with the operating system
in
/usr/bin/perl
for both 32-bit and 64-bit versions of Red Hat Directory Server.
2.3.2.2. File Descriptors
Editing the number of file descriptors on the Linux system can help Directory Server access files more
efficiently. Editing the maximum number of file descriptors the kernel can allocate can also improve file
access speeds.
1. First, check the current limit for file descriptors:
cat /proc/sys/fs/file-max
2. If the setting is lower than
64000
, edit the
/etc/sysctl.conf
file, and reset the
fs.file-max
parameter:
fs.file-max = 64000
3. Then increase the maximum number of open files on the system by editing the
/etc/security/
limits.conf
configuration file. Add the following entry:
* - nofile 8192
4. Edit the
/etc/pam.d/system-auth
, and add this entry:
session required /lib/security/$ISA/pam_limits.so
5. Reboot the Linux machine to apply the changes.
2.3.2.3. DNS Requirements
It is very important that DNS and reverse DNS be working correctly on the host machine, especially if
you are using TLS/SSL or Kerberos with Directory Server.
Configure the DNS resolver and the NIS domain name by the modifying the
/etc/resolv.conf
,
/
etc/nsswitch.conf
, and
/etc/netconfig
files, and set the DNS resolver for name resolution.
Edit the
/etc/defaultdomain
file to include the NIS domain name. This ensures that the fully-
qualified host and domain names used for the Directory Server resolve to a valid IP address and that
that IP address resolves back to the correct hostname.
Reboot the Red Hat Enterprise Linux machine to apply these changes.
2.4. HP-UX 11i
Directory Server runs on HP-UX version 11i only; earlier HP-UX versions are not supported. Directory
Server runs on a 64-bit HP-UX 11i environment as a 64-bit process.
